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  <title>Check if the IMAP stream is still active</title>
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  <div id="layout-content"><div id="function.imap-ping" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imap_ping</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imap_ping</span> &mdash; <span class="dc-title">Check if the IMAP stream is still active</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imap-ping-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>imap_ping</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$imap_stream</code></span>
   ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   <span class="function"><strong>imap_ping()</strong></span> pings the stream to see if it&#039;s still
   active. It may discover new mail; this is the preferred method for a
   periodic &quot;new mail check&quot; as well as a &quot;keep alive&quot; for servers which
   have inactivity timeout.
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.imap-ping-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    <dt>
<code class="parameter">
imap_stream</code></dt>
<dd>
<p class="para">由 <span class="function"><a href="imap_open.html" class="function">imap_open()</a></span> 返回的 IMAP 流。</p></dd>

   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.imap-ping-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns <strong><code>TRUE</code></strong> if the stream is still alive, <strong><code>FALSE</code></strong> otherwise.
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.imap-ping-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4032">
    <p><strong>Example #1 <span class="function"><strong>imap_ping()</strong></span> Example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$imap&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imap_open</span><span style="color: #007700">(</span><span style="color: #DD0000">"{imap.example.org}"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"mailadmin"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"password"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;after&nbsp;some&nbsp;sleeping<br /></span><span style="color: #007700">if&nbsp;(!</span><span style="color: #0000BB">imap_ping</span><span style="color: #007700">(</span><span style="color: #0000BB">$imap</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;do&nbsp;some&nbsp;stuff&nbsp;to&nbsp;reconnect<br /></span><span style="color: #007700">}<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>

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